主题：生物柴油的前途怎么样？ -- 晨枫

We first converted all nonroad and light-duty vehicle emissions data from absolute g/bhphr or g/mile to percent change in emissions. This process began by identifying the base fuel to which biodiesel had been added for each vehicle/test cycle combination, and averaging any

repeat measurements made on this base fuel. The percent change values for every emission measurement were then calculated with respect to this average base fuel emissions measurement, producing "observed" values. To calculate "predicted" values, we used our composite correlations to estimate the percent change in emissions of each pollutant for the specific biodiesel concentration associated with each nonroad or light-duty vehicle test.